William Chapman, MD
Transplant Surgery · Saint Louis, MONPI 1790703270
Payments from drug & device makers
What this record shows
This record is dominated by speaking fees: $5,769 of the $7,706 with a category attached, or 74.9%. Organox Ltd accounts for 89.8% of it on its own, with 5 other manufacturers making up the rest. 2025 is the largest year on record at $6,925, more than ten times the $155 reported in 2020.
Across 21 payments — averaging $366.94 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Organox Ltd$7K
- Intuitive Surgical$318
- Medtronic$156
- Covidien LP$155
- Sanofi$139
- AbbVie$18
Across 64 payments — averaging $6287.76 each. Payments tied to a research study. These frequently flow through the physician to a hospital or research institution rather than to the physician personally.
- Organox Ltd$164K
- Novartis$158K
- Artivion, Inc.$41K
- AstraZeneca$33K
- Davol Inc.$5K
- E.r. Squibb & Sons, L.L.C.$1K
What the payments were for
- Speaking & faculty fees$5,76975%
- Travel & lodging$5087%
- Food & beverage$1,42819%
General payments by program year
Who reported the general payments
Companies are grouped under their corporate parent — a single manufacturer often files under several CMS reporting entities. Research and ownership payments are counted separately and are not in this table.
| Company | Payments | Total |
|---|---|---|
| Organox Ltd | 11 | $6,919 |
| Intuitive Surgical | 5 | $318 |
| Medtronic | 1 | $156 |
| Covidien LP | 2 | $155 |
| Sanofi | 1 | $139 |
| AbbVie | 1 | $18 |
What the payments were tied to
Products named in the reported payments. Only payments of $100 or more are attributed here — the typical reported payment nationally is a meal worth about $16, and listing those product-by-product would be noise.
- METRA$6,639
- Signia$269
- Da Vinci Surgical System$235
- THYMOGLOBULIN$139
How this compares
Too few transplant surgery providers in Missourito place this figure against a meaningful peer group, so we don't.
Medicare billing
What this is not: this is the amount Original Medicare Part B allowed for services this provider billed in 2024. It is not their income. It excludes Medicare Advantage — now more than half of all Medicare enrollment — along with Medicaid and all commercial insurance, and it is gross practice revenue before staff, rent, supplies and malpractice premiums. CMS also suppresses any figure covering ten or fewer patients, so low-volume providers appear smaller than they are.
Most prescribed under Part D
| Drug | Claims | Cost to plans & patients |
|---|---|---|
| Envarsus XrTacrolimus | 26 | $29,936 |
| Valganciclovir Hcl | 123 | $19,177 |
| Atovaquone | 36 | $17,990 |
| VemlidyTenofovir Alafenamide | 11 | $15,945 |
| LokelmaSodium Zirconium Cyclosilicate | 15 | $11,185 |
| Mycophenolic AcidMycophenolate Sodium | 44 | $3,704 |
| Entecavir | 92 | $3,202 |
| Tacrolimus | 29 | $2,186 |
| Sulfamethoxazole-TrimethoprimSulfamethoxazole/Trimethoprim | 265 | $1,322 |
| Pantoprazole Sodium | 159 | $768 |
| Nifedipine ErNifedipine | 36 | $512 |
| Dapsone | 12 | $484 |
| Midodrine Hcl | 11 | $400 |
| Prednisone | 50 | $247 |
| Carvedilol | 46 | $159 |
Paid to pharmacies, not to this prescriber.
Other transplant surgery in Saint Louis
- Jason WellenSaint Louis$617K
- Harvey SolomonSaint Louis$6K
- Jesse DavidsonSaint Louis$4K
- Surendra ShenoySaint Louis$2K
- Paul GarvinSaint Louis$274
- Mustafa NazzalSaint Louis$245
- Matthew WilkinsonKansas City$9K
- Henry RandallKansas City$2K
- Clark BonhamKansas City$212
- Alice CraneKansas City$186
Where these figures come from
- Payments: CMS Open Payments, program years 2019–2025 (publication P06302026_06032026).
- Billing: Medicare Physician & Other Practitioners, data year 2024. Original Medicare Part B only.
- Identity: NPPES NPI Registry, July 2026.